Work-holder for drilling-machines



(No Model.) I

n. GLSTOVER.

- WORK HOLDER FOR DRILLING MACHINES.

No. 246,350. Patented Aug. 30,1881.

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q ITE STATES PATENT GFFICE.

DANIED O. STOVER, OF FREEPORT, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 246,350, dated August30, 1881.

Application filed June 20, 1881. (No model.)

'To all whom it may concern:

Be it known that I, DANIEL O. Srovnn, of the city of Freeport, county ofStephenson, and State of Illinois, haveinvented a new and usefulimprovement in work-holders for holding work upon the bed-plate of adrill.

As it is necessary that the bedplate should have a smooth, fiat, evensurface, without obstructions of any kind thereon, in order toaccommodate it to large or small work, it is to a great extentimpracticable to attach any kind of device permanently thereto.

The object of my invention therefore is to provide a cheap and simpleattachment that may be readily placed upon the bed-plate (or removedtherefrom, as necessity may require) for the purpose of holdingirregular pieces of metal in any required position under the tool.

The following is a full, clear, and exact description of my invention,reference being had to the accompanying drawings, of which Figure 1 is aperspective view, showing the top of my work-holder. Fig. 2 is a bottomview of the same, and Fig. 3 is a top view of the bed-plate of a drillupon which my workholder is designed to be placed.

Like letters represent like parts of the different figures.

A, Fig. 1, represents a circular iron plate, preferably cast at or nearthe size of a drillbed, and of sufficient thickness to give it theproper strength.

a a a to indicate holes bored into the same, and Z) Z) iron or steelpins, made to fit loosely therein, so that they may be removed by handto fit work of varying size and shape.

B represents a slot cut in the plate and extending radially from itscenter nearly to its periphery. At the outer end of this slot, and atright angles thereto, forming a cord to the periphery of the plate,andcast solidly thereto, is a raised lug, (3, through which, in thedirection of the center of the plate A, are screwholes 0 c, in eitherone of which may be inserted the set-screw d.

On the bottom of the plate A are cast or otherwise rigidly attachedthereto the lugs e 6. These lugs are placed in such position upon theplate A as to drop loosely into the radial slots ffff, Fig. 3, of thebed D.

When the plate A is placed upon the bed D the work may be laid thereonand secured in any desired position by adjusting the pins I) b in suchof the holes a a as may be found necessary and turning the set-screw d,thereby forcing the work firmly against the pins 1) I); also, when theshape of the work admits thereof, a part may be inserted in the slot B,to give additional security. I

Any number of holes a may be used and placed in any desired position;but I prefer to place them radially, in the manner indicated in Fig. 1,as I believe this arrangement sufficient to accommodate work of anyshape.

The adjustment of the lugs e 6 permits the use of the work-holder uponany-sized bed, and the turning of the drill by bringing the lugs e cfirmly against the sides of the radial slots ffff prevents any movementor variation of the holder.

It is obvious that by the use of my improved work-holder the workman maybe enabled to save much timein securing pieces of irregular shape inproper position for drilling. Moreover, by its use and its perfectadaptability to thoroughly secure the work in position, the drillreadily finds its own center, and a great saving from breakage of drillsand bending of drill-shanks is the result.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. A work-holder consisting, essentially, of a detachable plate providedwith holes arranged substantially as described, and pins fittingtherein, together with an elevated lug, with a set-screw therein,substantially as' and for the purpose set forth.

2. A work-holder consisting of a plate provided with holes arrangedsubstantially as described, and pins fitting therein, together with anelevated lug, with a set-screw therein, and also provided with lugsbeneath the same for insertion into radial slots of adrill-press bed,substantially as described.

3. The combination of a drill press bed with a detachable work-holder,provided with holes upon the upper side thereof, and pins fittingtherein, together with an elevated lug, with a set-screw therein,substantially as and for the purpose set forth.

DANIEL Q. STOVER.

Witnesses: V

H. G. HYDE, A. T. GREEN.

